Porcine insulin (from pigs) is an exact amino acid match to that of dogs. 
It differs from human insulin in one position. At B #30 on the B insulin chain, dogs and pigs have Alanine, while people have Threonine. It differs from bovine in two positions, both on the A insulin chain: pigs have Threonine at A #8 while cows have Alanine. At the #10 position on the A insulin chain, pigs have Isoleucine--cows have Valine.
Though this shows CP Pharma's Hypurin pork insulins,  this information would also apply to Novo's Pork Insulatard, Pork Actrapid, and Pork Mixtard 30.  They can also be applied to compare these to Lilly's former Iletin II R and Iletin II NPH.
These insulins are natural and entirely or partly derived from pork (pig) sources. Only Iletin I R shown on the list below was a mixture of bovine and porcine insulins; it was composed primarily of beef (apx. 85/90%).
This means that they are identical to canine natural insulin, and a bit closer to feline than human insulin is.
See also bovine insulins.
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